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发布时间：2006-06-23 11:59     点击：

(E) U is interviewed on Tuesday　　

(F) Y is interviewed at some time before Thursday

Questions 18-24　　

During a four-week period, each of seven previously unadvertised products-G, H, J, K, L, M, and O-will be advertised. A different pair of these products will be advertised each week. Exactly one of the products will be a member of two of these four pairs. The following constraints must be observed:　　

J is not advertised during a given week unless

H is advertised during the immediately preceding week. 　　

The product that is advertised during two of the weeks is advertised during week 4 but is not advertised during week 3　　

G is not advertised during a given week unless either J or else O is also advertised that week.　　　

K is advertised during one of the first two weeks　　

O is one of the products advertised during week 3

18. Which one of the following could be the schedule of advertisements?　　

(A) week 1: G, J; week 2: K, L; week 3: O, M; week 4: H, L　　

(B) week 1: H, K; week 2: J, G; week 3: O, L; week 4: M, K　　

(C) week 1: H, K; week 2: J, M; week 3: O, L; week 4: G, M　　

(D) week 1: H, L; week 2: J, M; week 3: O, G; week 4: K, L　　

(E) week 1: K, M; week 2: H, J; week 3: O, G; week 4: L, M

19. Which one of the following is a pair of products that CANNOT be advertised during the same week as each other?　　

(A) H and k 　　(B) H and M　　(C) J and O　　

(D) K and L　　(E) L and M

20. Which one of the following must be advertised during week 2?　　

(A) G　　(B) J　　(C) K　　(D) L　　(E) M

21. Which one of the following CANNOT be the product that is advertised during two of the weeks?　　

(A) G　　(B) H　　(C) K　　(D) L　　(E) M

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